Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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How to serialize the CBlock Class in C++ and print the hex to terminal?

I have tried to serialize as follows without success: bitcoin tag v22.0 from github. In the file src/miner.cpp and the function function std::unique_ptr<CBlockTemplate> BlockAssembler::...
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Why I can see this transaction data of the first block?

I don't think there is anyone moved Genesis Block. But when I check it with blockchain.com, why I can see one transaction? https://www.blockchain.com/btc/address/1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa
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I lost passphase to my wallet in Bitcoin core How can I Recover it because I want to change my computer [duplicate]

I thought of mining And so I Created a Wallet but ended up using it forinvesting instead And Now I don't know Its Password Can anybody help me I am even happy to pay a bit but please help me
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Can the government find out my name, address, details etc if I invest in crypto?

The data of the transactions are all stored in a blockchain right. So, will anyone trying to trace me find out my name, address etc if I buy cryptocurrencies? Sorry I am a complete noobie to this ...
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Blockchain node and Bitcoin platform

If i use Bitcoin platform like binance and if i make a transaction (e.g. selling bitcoin), do i make such transaction as a single node (in blockchain's term)? or everything is done on binance server?
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How a user in the Bitcoin network verifies a payment?

I'm a beginner who's trying to learn the idea behind Bitcoin. In the Bitcoin whitepaer it's said that: A user only needs to keep a copy of the block headers of the longest proof-of-work chain, which ...
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how does new exchanges order books work?

When a new exchange is launched and it doesn't have many users, how does it managed an order book? how can they match orders when there's not enough of them?
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Who first started to name 'blockchain technology' as 'blockchain'

I read through the whitepaper of Satoshi Nakamoto. I could find the expression 'blocks are chained...' but he did not specifically use the word 'blockchain' itself. I want to know the origin of the ...
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Need help with OLD WALLET.DAT

I have a problem determining if the coins in this wallet are real in the first place. I know the passphrase to the wallet. The original bitcoin qt and the wallet are from another device that was ...
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How did Satoshi Nakamoto mine 50 bitcoins by creating genesis block? And where can I see blockchain?

According to bitcoin.org, mining is referred to as 'the process of spending computing power to process transactions, secure the network, and keep everyone in the system synchronized together'. First, ...
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It only takes 20,000 computers to alter the Bitcoin blockchain?

Google says As of now, there are roughly 12,130 public nodes running on the Bitcoin network. So in a nearby small city, there are 70,000 people. If 1 household is assumed to have 3 people on average,...
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What are some resources that would help me become a Blockchain developer?

I'm a backend developer with experience in web development and microservice architectures. I have already worked a lot with some languages like C#, Java, C++, etc. As my next step, I want to become ...
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If I sent the USDT to the scammer's ERC20 &TRC20 addresses, is there any chance to get them back? [closed]

I was scammed by a man from an online dating site, I lost everything but even in debt... After he got my trust and started teaching me how to invest in Bitcoin. He sent me a fake platform link, I ...
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what is the confirmation section in the block info?

in the details of a bitcoin block there's a section called block confirmation (which is different than transaction confirmation), first i thought it was the number of the blocks that are created after ...
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blockchain nodes that dont get the new block

i read somewhere that after 40 second of creating a new block in the blockchain there's still 5% of the nodes that does not have the block, what happens to them if they were offline or down at that ...
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what is block confirmation [duplicate]

in the details of a bitcoin block there's a section called block confirmation (which is different than transaction confirmation), first i thought it was the number of the blocks that are created after ...
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31 views

What is Denominator Output & Blockchain Observer Link [Bitcoin]

Can someone help me understand if can a blockchain observer link the inputs of a user to their change outputs in any way? While reading about blockchain observer links, I also came across the term &...
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Regarding the chainstate level db (UXTO)

Already found many useful information regarding the chainstats db. such as: What are the keys used in the blockchain levelDB (ie what are the key:value pairs)? But what is the meanning of the last ...
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2answers
58 views

Given a tx hash, is it possible to know if it's someone selling or buying bitcoin?

I'm working on a project that involves identifying sales and purchases in the Blockchain. Is there any way to do this with the blockchain.com API?
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Ethereum Batch Transaction - Using web3.BatchRequest() [migrated]

I am trying to batch multiple transactions into a single transaction. The point is to reduce transaction/gas fee which I would need to pay if I am making 5 separate transactions than combining all 5 ...
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1answer
262 views

How does validating a transaction get more and more hard?

As far as I know, to prevent double-spend attack and to confirm that a specific transaction is valid, miners have to go through all blocks in the blockchain and check the sender's history of ...
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1answer
68 views

What stops a hacker changing the last block?

Say a hacker is tinkering with a receivers public key in the latest block in a chain such that they change it to their own public key and intercept the transaction. The verifying process is only ...
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Have I been scammed - Blockchain Liquidity front runner bot?

I hope you are well. I followed the instructions in this video https://youtu.be/Iv0kqEJXdfE EXACTLY as shown, and my created contract address is now showing "0" in value, after I previously ...
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What type of processes do smart contracts represent?

Smart contracts of blockchain technology are computer programs that are considered to automate business processes. My question is that what type of processes do smart contracts represent? For example, ...
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How Bitcoin transaction requests are sent to miners? [duplicate]

When we do any transactions in bitcoin we need to send the transaction request to some bitcoin miner. How do we find the available miners' address?
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6answers
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Where does compensation to miners come from?

I am still learning so my terminologies might not be entirely accurate. But I understand that in the traditional model, if person A pays person B $10, then the banks subtract $10 from person A's ...
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How to fetch the last month's block and transactions from mempool?

I want to fetch last month's block and transactions from mempool using typescript. And then persist this to MongoDb. In mempool API-REST there is a code of "GET_Block". import mempoolJS from ...
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1answer
37 views

Rescan starts not from first block

I have a complete blockchain but when I set rescan = 1 in .conf file my bitcoind starts rescaning from 435000 block. How to start it from the first block? What's wrong with my blockchain?
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How transactions or wallet balance are retrieved from bitcoin blockchain?

Using different blockchain explorers one can retrieve the wallet balance or transactions of address. My question is how does this query works do they search the whole blockchain for the related ...
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1answer
44 views

How did bitcoin spread its first rewards

I know that in the genesis block, Satoshi Nakamoto got 50 bitcoin's and there are certain rumors that the first transaction destinations, were are also to his other wallet's, but if he never spent any ...
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1answer
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Curious about the Math that makes Bitcoin/Blockchain work ! Any good resources to learn it?

A bit of a background about me ; Computer Engineer but during my studies i didn't dive too deep into the maths , especially the maths that makes the blockchain and cryptography work looking for advice ...
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1answer
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Is there any way to activate full 'leech' mode?

As I understand, bitcoin basically represents a situation where nodes are expected to (and do) serve other nodes in the network, information that represents the money of all transactions in that ...
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Can i recover missed phrase on p2sh wallet?

i have a wallet from past with p2sh format ,also i know my private key but i just lost 4 character of that,i tried few apps to recover that but no one works(they work on another wallets prefectly),i ...
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I WAS SENT BITCOINS IN A WRONG ADRESS ( the last digit is missing in the adresse )

i sent my wallet at coinbase to the sender today 355CXardXvii8T4MNbBaQbfJD7YQNdUf5a but the sender sent to a wrong adress 33 digits missing the 34th digit 355CXardXvii8T4MNbBaQbfJD7YQNdUf5 will the ...
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If NFTs are unique instances of data on a blockchain, what keeps a different chain from having the same piece of data?

I apologize, I tried to make the title as concise as I could. If a Blockchain, say the Bitcoin chain, has some NFT that exists uniquely (by definition of an NFT) on that blockchain, what prevents the ...
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1answer
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What if there where no nodes to share a new block

I am fairly new to blockchain technology, so bear with me if i make mistakes So lets say there are 10 people trading a cryptocurrency 5 of them are online from 8 to 10 am and the other half on online ...
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2answers
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How download whole blockchain and preprocess it for analysis?

Will be grateful for any information/starter points/tuts etc. For ex. this question (answers don't contain any "real" answer, any url to "blockchain files", any suggestion where to ...
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38 views

Can I somehow find the wallet id of every trade?

I know we can see the trade flow of BTC trades. Is it somehow possible to associate each trade to a waller? Ie. the initiator of the trade?
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1answer
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Block 9 Transaction 1 Output 0 ScriptPubKey openssl validation fails

I'm trying to check the public key which lies in the ScriptPubKey of output #0 of transaction #1 bloc #9 with openssl. I'm using Python to create a DER file, and openssl to check it. ScriptPubKey ...
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49 views

What is the best site/tool/way for finding the RSZ values of a bitcoin transaction? [duplicate]

The two most popular sites for doing this are down which are https://2coin.org/ and https://2xoin.com/getRSZfromRawTX/ with no indication they'll ever return to be usable. Can anyone here link any ...
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4answers
92 views

How are funds verified?

I understand that transactions go into mempool and a miner "verifies" the transactions such as ensuring the user has the appropriate funds and correct signature. Specifically, how are ...
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1answer
43 views

Miner attack lightning network

Can miners attack lightning network making it unusable with the hope that the transaction are forced to be processed on-chain, and they earn more transaction fee?
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1answer
51 views

developing hd wallet using bip32 and bip 39

I'm developing a HD wallet using C#. I want to use this wallet for multiple blockchains like bitcoin, ethereum, dogecoin etc... I've read that I should use bip32 for my wallet. i know what's bip32 but ...
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Ternary Merkle Tree - concatenation and Merkle Proof?

Unlike binary Merkle trees, ternary have 3 leaf nodes. I wanted to understand how do we eventually get to the Root Merkle node -- is it by concatenating in the pair of 3 (considering 3 leaves in every ...
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1answer
68 views

Coinbase to Blockchain Transaction

Hello everyone! Recently i received a cryptocurrency to my Blockchain Wallet. The Bitcoin was sent from Coinbase to my address - I waited for about an hour. And i don't see the transaction and the ...
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48 views

What is the Crypto in Metaverse

When I read about the Metaverse in today's crypto space, I think of Second Life and my understanding is that Metaverse as used in today's crypto space is basically Second Life with VR but this looks ...
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1answer
28 views

Saving diskspace in bitcoin with a sort of snapshot of the blockchain

I am reading that some people try to save diskspace in what information is stored in the blockchain. I am wondering if it is possible to save such a diskspace in taking a sort of snapshot of the ...
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how are new bitcoins created [duplicate]

I have read that new bitcoins are generated by a competitive and decentralized process called "mining" i want to know how the first coin was generated? From where is it genrated? Mining is ...
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1answer
44 views

UNIX END TIME January 19, 2038 - Will it affect Timelock nLOCKTIME smart contracts past that date?

So UNIX END TIME is January 19, 2038. What will happen then to the btc TX that looks at Unixtime for nLOCKTIME transactions? Will any Locktime transaction past that date, say to 2040 be an issue? Or ...
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Reciever hasnt got my deposit [duplicate]

bascilly i deposited £91 in the receiver address on 3ocassion prior he says he not recieved deposit but on blockchain it was received from 7.17am Then the investor kindly tellsme at 2.30 pm its not ...

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